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You are perfectly clear to us, but maybe we haven't been to you.
In a restatement of what DaWei said: The return value is not something that PHP knows the meaning of, it is set by the program you've executed at the end of processing... Please refer to the documentation for whatever program you are calling to determine what 0 (commonly EXIT_SUCCESS meaning a successful exit of the program) and 1 (commonly EXIT_FAILURE meaning a successful exit of the program) mean in terms of that particular 'program'...
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